Peripheral component interface express (PCIe) switching circuit and method for global asynchronous in-station synchronization

Abstract

The invention provides a global asynchronous in-station synchronization PCIe switching circuit and method, the system comprises a plurality of station modules, and all the station modules are jointly connected with an access arbitration module; the access arbitration module interacts with an external EERROM through an EERROM controller, and the access arbitration module interacts with an external IIC host through an IIC bus controller; the station module is connected with an upstream port through a PCIe link; according to the method, the circuit is divided into a plurality of station modules, the overall structure of the circuit is simple, the function division of each module is reasonable, and efficient parallel logic design of the sub-modules is facilitated; all ports in the same station work in the same clock domain, different stations can work in different clock domains, the clock domains of the circuit are separated clearly and concisely, cross-clock-domain design and check can be conveniently carried out, the common cross-clock-domain design risk is greatly reduced, and the reliability of the circuit is ensured.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design, and relates to a PCIe switching circuit and method for global asynchronous intra-station synchronization. Background technique [0002] PCIe bus is the third-generation high-performance IO bus launched after the first-generation EISA, ISA, VESA bus and the second-generation AGP, PCI, and PCI-X bus, and is widely used in computer systems. [0003] In a PCIe system, a PCIe switch circuit (Switch) is used to interconnect multiple electronic components or modules for communication. The PCIe switching circuit integrates multiple virtual PCI-to-PCI bridges, generally having two or more PCIe ports, the upstream port (Upstream Port) is connected to the root complex (Root Complex, RC), and the downstream port (Downstream Port) is connected to the Root Complex (RC). Port) to connect the endpoint (Endpoint) device. figure 1 A conceptual logical block diagram of a PCIe switch circuit. ...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of global asynchronous intra-station synchronous PCIe switch circuit and method, to solve the existing problem of lacking PCIe switch circuit and its own mechanism to realize switching

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